M/T’s signature cast-aluminum valve covers for the Hemi Ford are the same pieces that fit on production 331 through 392 CID Chrysler Hemi V8s, and the M/T Pontiac hemi, too—the covers and gaskets are all interchangeable. They also fit the aluminum replacement cylinder heads M/T produced for the Chrysler hemi, naturally. The spark plug tubes are Mopar replacement parts.

Craig Breedlove is best known for his land speed record (LSR) activities, but he also co-owned a speed equipment company called Spirit in the sixties – aptly named after his “Spirit of America” LSR cars. Spirit manufactured a variety of cast aluminum engine parts including blower drives, manifolds and these rare Hemi rocker covers. Their straight ends tell us they’re for 1964 – ’65 heads only. Chrysler added a slight curvature to the 1966-up Street Hemi heads and rocker arm covers to clear the optional power steering pump on assembly line-built Street Hemi cars. The ’64/'65 Race Hemi valve covers do not fit 1966-present Street Hemi heads. Note the integrally cast threaded oil fill holes which give the bizarre illusion of five spark plug holes.